<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title>我的第一个项目</title>
		<style>
			div{
				width: 200px;
				height: 200px;
				background-color: red;
				margin: 200px auto;
			}
		</style>
	</head>
	<body>
	</body>
	<div></div>
</html>
